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Endothelial cells regulate neural crest and second heart field morphogenesis.

Michal Milgrom-Hoffman1, Inbal Michailovici1, Napoleone Ferrara2

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Area of Science:

  • Developmental Biology
  • Cardiovascular Research
  • Craniofacial Development

Background:

  • Cardiac and craniofacial development are closely linked during embryogenesis.
  • The molecular mechanisms of crosstalk between mesoderm, neural crest, and endothelial cells are not well understood.
  • Birth defects frequently affect both cardiac and craniofacial regions.

Purpose of the Study:

  • To investigate the role of endothelial cells in cardio-craniofacial development.
  • To elucidate the molecular signaling pathways involved in the coordination of these developmental programs.

Main Methods:

  • Genetic ablation of vascular endothelial growth factor receptor 2 (Flk1) in mouse mesoderm.
  • Analysis of embryonic lethality, cardio-craniofacial morphology, and cell populations.
  • Assessment of Transforming growth factor beta 1 (Tgfb1) levels and extracellular matrix (ECM) composition.

Main Results:

  • Flk1 ablation in mesoderm caused embryonic lethality, severe cardio-craniofacial deformation, and vascular defects.
  • Endothelial cells were found to be essential for cranial neural crest cell migration and survival.
  • Reduced Tgfb1 and altered ECM composition were observed following endothelial cell deficiency.

Conclusions:

  • Endothelial cells are critical coordinators of cardio-craniofacial morphogenesis.
  • A conserved signaling circuit involving Tgfb1 regulates ECM remodeling and is mediated by endothelial cells.
  • These findings provide insights into the molecular basis of cardio-craniofacial birth defects.